单项选择题

It can be concluded from Dr Dubos' remarks that ______.

A．people find invisible diseases difficult to deal with
B．attacks by hidden enemies tend to be fatal
C．diseases with obvious sighs are easy to cure
D．people tend to overlook hidden dangers caused by pesticide
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单项选择题
Which of the following is closest in meaning to the sentence Man, ...is part of nature. (Line 3-4, Para. 1)
A．Man appears indifferent to what happens in nature.
B．Man acts as if he does not belong to nature.
C．Man can avoid the effects of environmental pollution.
D．Man can escape his responsibilities for environmental protection.
单项选择题
In the author's view, the sudden death caused by exposure to large amounts of pesticides
A．is not the worst of the negative consequences resulting from the use of pesticides
B．now occurs most frequently among all accidental deaths
C．has sharply increased so as to become the center of public attention
D．is unavoidable because people can't do without pesticides in farming
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